Helminth infections and hybridization between Haemonchus contortus and Haemonchus placei in sheep from Santana do Livramento, Brazil

The occurrence and intensity of helminth infections were evaluated in sheep from pastures shared with cattle. In 2015 and 2016, young male sheep acquired in Santana do Livramento, Rio Grande do Sul, Brazil, were finished in integrated crop-livestock system. We selected the 12 sheep that showed the h...

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Published in:Revista brasileira de parasitologia veterinaria 2018-07, Vol.27 (3), p.280-288
Main Authors: Almeida, Fabiana Alves de, Bassetto, César Cristiano, Amarante, Mônica Regina Vendrame, Albuquerque, Ana Cláudia Alexandre de, Starling, Renan Zappavigna Costa, Amarante, Alessandro Francisco Talamini do
Format: Article
Language:English
Subjects:
Animals
Brazil - epidemiology
Cooperia
Feces - parasitology
Haemonchiasis - diagnosis
Haemonchiasis - epidemiology
Helminthiasis, Animal - diagnosis
Helminthiasis, Animal - epidemiology
Helminthiasis, Animal - parasitology
Male
Nematodirus
Ostertagia
PARASITOLOGY
Prevalence
Sheep - parasitology
Sheep Diseases - diagnosis
Sheep Diseases - epidemiology
Sheep Diseases - parasitology
Taenia hydatigena
Teladorsagia
Trichostrongylus
VETERINARY SCIENCES
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Summary:The occurrence and intensity of helminth infections were evaluated in sheep from pastures shared with cattle. In 2015 and 2016, young male sheep acquired in Santana do Livramento, Rio Grande do Sul, Brazil, were finished in integrated crop-livestock system. We selected the 12 sheep that showed the highest number of nematode eggs per gram of faeces to search for worms in the gastrointestinal tract. Haemonchus contortus and Trichostrongylus colubriformis were the major parasites. H. contortus presented mean intensities of 1,159 and 257 worms in 2015 and 2016, respectively. T. colubriformis displayed mean intensities of 4,149 and 2,427 worms in 2015 and 2016, respectively. Of the 127 male specimens of Haemonchus spp. analysed by Polymerase Chain Reaction (PCR), 125 were H. contortus, one Haemonchus placei and one hybrid. Other species detected were Cooperia punctata , Cooperia pectinata, Cooperia spatulata, Cooperia curticei, Ostertagia ostertagi, Teladorsagia circumcincta , Trichostrongylus axei, Nematodirus spathiger , and Trichuris ovis. Twenty lambs presented cysts of Taenia hydatigena in the liver and mesentery. One lamb presented Coenurus cerebralis, the larval stage of Taenia multiceps, in the brain. In conclusion, sheep from pasture shared with cattle presented a high diversity of nematode species. H. contortus and H. placei co-infection occur with consequent hybridization.
ISSN:0103-846X
1984-2961
1984-2961
DOI:10.1590/S1984-296120180044